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Penetration depth information


The penetration depth of X-rays in water as function of photon energy.

Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material. It is defined as the depth at which the intensity of the radiation inside the material falls to 1/e (about 37%) of its original value at (or more properly, just beneath) the surface.

When electromagnetic radiation is incident on the surface of a material, it may be (partly) reflected from that surface and there will be a field containing energy transmitted into the material. This electromagnetic field interacts with the atoms and electrons inside the material. Depending on the nature of the material, the electromagnetic field might travel very far into the material, or may die out very quickly. For a given material, penetration depth will generally be a function of wavelength.

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Penetration depth

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Penetration depth is a measure of how deep light or any electromagnetic radiation can penetrate into a material. It is defined as the depth at which the...

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London penetration depth

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In superconductors, the London penetration depth (usually denoted as λ {\displaystyle \lambda } or λ L {\displaystyle \lambda _{L}} ) characterizes the...

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Penetration

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or structural penetrant Penetration (weapons), the ability to pierce the target's armor or other protection Penetration depth of light or any electromagnetic...

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Frost line

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known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the...

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Thermoacoustics

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thermoacoustic element is the value of the thermal and viscous penetration depths. The thermal penetration depth δκ is the thickness of the layer of the gas where...

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Josephson effect

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2 {\displaystyle \lambda _{2}} are their London penetration depths. The Josephson penetration depth usually ranges from a few μm to several mm if the...

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Radiation burn

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attributable to bremsstrahlung. The penetration depth depends also on beam shape, narrower beam tend to have less penetration. In water, broad electron beams...

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Mathematical descriptions of opacity

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mathematical relationships among: attenuation coefficient; penetration depth and skin depth; complex angular wavenumber and propagation constant; complex...

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London equations

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magnetic fields are exponentially suppressed: it is called the London penetration depth: typical values are from 50 to 500 nm. For example, consider a superconductor...

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Impact depth

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Predicting Depth of an Earth Penetrating Projectile (Report). Vol. SC-DR-67-60. Albuquerque NM: Sandia National Laboratories. Young, C.W. (1997). Penetration Equations...

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Meissner effect

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London penetration depth, the magnetic field is not completely canceled. Each superconducting material has its own characteristic penetration depth. Any...

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Skin effect

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the phase of the current density is delayed 1 radian for each skin depth of penetration. One full wavelength in the conductor requires 2π skin depths, at...

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Induction heating

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coupling (between the work coil and the object to be heated), and the penetration depth. Induction heating allows the targeted heating of an applicable item...

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Critical field

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magnetic field is not quite zero at the edges of any given sample – a penetration depth applies. For a type-I superconductor, the current must remain zero...

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Missionary position

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Variations of the position allow varying degrees of clitoral stimulation, depth of penetration, participation on the part of the woman, and the likelihood and speed...

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Superconductivity

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and consequently to a longer London penetration depth of external magnetic fields and currents. The penetration depth becomes infinite at the phase transition...

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Alpha particle

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They are a highly ionizing form of particle radiation, with low penetration depth (stopped by a few centimetres of air, or by the skin). However, so-called...

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Total internal reflection

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called the "penetration depth" of the evanescent wave. Taking reciprocals of the first equation of (12), we find that the penetration depth is d = λ 0...

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Flux pinning

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comparable to the London penetration depth, the magnetic field can pass through the material. The act of magnetic penetration is what makes flux pinning...

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Standard penetration test

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The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of...

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Eddy current

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increase eddy currents, even with non-uniform field penetration.[citation needed] The penetration depth for a good conductor can be calculated from the following...

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Ballistic gelatin

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Velocity Variation Correction to Measured BB Penetration Depth, can be used to make corrections to BB penetration depth when measured BB velocity is within ±10 m/s...

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